My little boy is starting t-ball and I desperately need a lens for my Digital Rebel. The lens that came with it blows for anything like sports. Do I really have to spend a freaking mint for a 300mm? What are the cheap lenses you see on Ebay? They are going for like 200 bucks to get up to 300 mm. Think they start at 80mm or soemthing. I love taking stills, but I just can't afford a grand for the canon lens. Any suggestions?